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Assume that all the terms in the Drake equation have the values given in the text, except for N and L. (a) If there are 1000 civilizations in the Galaxy today, what must be the average lifetime of a technological civilization? (b) What if there are a million such civilizations?
A small turtle moves at a speed of 359 furlongs per fortnight. Find the speed of the turtle in centimeters per second. Note that 1 furlong = 220 yards and 1 fortnight = 14 days
On an icy road, a 1200 kg car moving at 55 km/h strikes a 430 kg truck moving in the same direction at 43 km/h. Find the speed of the wreckage
Five computers are plugged into 120V wall outlet in parallel. Each computer has a resistance of 50ohm when running. a) Sketch the schemetic of this circuit. b) Calculate the effective ressitance.
On a certain amusement park ride, passengers are seated in a horizontal circle of radius 7.5m. the seats begin to rotate from rest and are uniformly accelerated for 21 seconds to a most rotational speeds of 1.4 rad/s.
illustrate the refraction of a light ray from a medium of higher speed to a medium of lower speed. label each of the
determine the force exerted by the wood on the bullet.
A capacitor with air between its plates is charged to 80 V and then disconnected from the battery. What is the dielectric constant of this glass
A bucket of mass 2.00 kg is whirled in a vertical circle of radius 1.10 m. At the lowest point of its motion the tension in the rope supporting the bucket is 25.0 N. Find the speed of the bucket
The depth of a body of water can be found by emitting sound pulses at the surface and dectecting the pulses reflected from the bottom. what is the depth of the water
Let the drag force on a ball of mass m moving through air in the gravity-free bubble include both "viscous" drag F1=-kv, Find the velocity v of a ball thrown with initial speed v0.
A wedge of mass M and angle a slides freely on a horizontal plane. A particle of mass m moves freely on the wedge. Determine the motion of the particle as well as that of the wedge.
a 200g mass lying on a frictionless table is attached to a horizontal spring with a spring constant of 400 N/m. what is the initial potential energy of the system
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